Herboxidiene derivatives and uses thereof

ABSTRACT

Described herein are compounds of the formulae (I)-(III) and (Ia)-(IIIa) and pharmaceutically acceptable salts, isomers, mixture of isomers, crystalline forms, non-crystalline forms, hydrates, or solvates thereof, as well as methods using compounds of the formulae (I)-(III) and (Ia)-(IIIa) to, among other things, treat cancer.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a U.S. National State Filing under 35 U.S.C. § 371 from International Application No. PCT/US2018/043894, filed 26 Jul. 2018, and published as WO2019/023450 A1 on 31 Jan. 2019, which claims the benefit of U.S. Provisional Application Ser. No. 62/537,129, filed Jul. 26, 2017, which are incorporated by reference as if set forth herein in their entirety.

STATEMENT OF GOVERNMENT SUPPORT

This invention was made with government support under grant GM053386 awarded by the National Institutes of Health. The government has certain rights in the invention.

BACKGROUND

Antibody drug conjugates (ADC) are an important class of anticancer agents that incorporate selectivity through targeted drug delivery systems using potent cytotoxic agents with novel mechanisms. Innovative linker technology, as well as natural product-based highly potent cytotoxic agents as payload, sometimes led to the development of effective and safe ADCs in recent years. Thus far, T-DMI for metastatic breast cancer and brentuxi-mab vedotin, for refractory Hodgkin Lymphoma, are approved by the FDA and a number of other agents are in advanced clinical development.

Among various cytotoxic payloads, compounds that inhibit spliceosome are particularly receiving attention. Pre-messenger RNA (pre-mRNA) splicing is a critical step in gene expression where noncoding sequences (introns) are removed and the coding sequences (axons) are joined to form mature mRNA. A large intracellular complex made up of over 150 proteins and ribonucleoproteins carries out these splicing events in eukaryotic cells. The pre-mRNA splicing involves multiple interactions between pre-mRNA, ribonucleoproteins and spliceosome proteins. The process is highly complex and errors in RNA splicing and its regulation lead to many different human diseases. Since MRNA is more accessible than DNA in an in vivo cellular scenario, spliceosomal inhibition by small molecules has been an attractive choice for anticancer drug development. But additional drugs that can be conjugated to prepare ADCs are still necessary.

SUMMARY

The ADC field has provided a new opportunity for anticancer drug development with innovative modification of natural products. Over the years, the inventors have synthesized a number of natural products, including herboxidiene/GEX1A having the formula:

that exhibit spliceosome inhibitory activity, where the portion of the molecule labeled “A” herein is often referred to as the “A-ring” and the portion of the molecule labeled “B” herein is referred to as the “B-section” of the molecule.

Herboxidiene/GEX1A was isolated from a culture broth of Streptomyces SP in 2002. This molecule induces both G1 and G2/M cell cycle arrest in a human normal fibroblast cell line, W1-38. The anticancer activity of herboxidiene is linked to its interaction with SAP155 protein, a subunit of SF3B responsible for pre-mRNA splicing.

The inventors recently accomplished practical syntheses of herboxidiene and GEX1Q1. In addition, they have carried out syntheses of a number of structural derivatives of these spliceosome inhibitors. For example, the inventors have made modifications including (i) synthesizing the corresponding cyclohexyl derivatives of the A-ring tetrahydropyran; and (ii) synthesizing the 6-desmethyl derivative, among other modifications.

In the course of conducting biological studies, the inventors ha learned some of the consequences of such modifications. While not wishing to be bound by any specific theory, it is believed that the tetrahydropyran ring oxygen is important to “splicing activity,” whereas the 6-methyl may be important for stabilizing the active conformation of herboxidiene.

DESCRIPTION

Reference will now be made in detail to certain examples of the disclosed subject matter. While the disclosed subject matter will be described in conjunction with the enumerated claims, it will be understood that the exemplified subject matter is not intended to limit the claims to the disclosed subject matter.

Various examples described herein are directed to a compound of the formula (I):

or a pharmaceutically acceptable salt, isomer, mixture of isomers, crystalline form, non crystalline form, hydrate, or solvate thereof wherein:

-   -   Y is alkoxy or:

(a) a group of the formula:

wherein: X⁶ is O or N, it being understood that R¹⁴ is absent if X⁶ is O; Y¹ is an amino acid side chain; L¹ is the group CH(Y¹)NHC(O)CH(Y¹), wherein each Y¹ is, independently, an amino acid side chain; R¹⁴ is H, alkyl or a nitrogen protecting group; R¹⁵ is H or (CH₂)_(p)—R¹⁶, wherein R¹⁶ is N₃, —C≡C—CN, NHR¹⁴, or a maleimide group and p is an integer from 0 to 6; X⁷ is NHR¹⁴, OR¹⁷ or O(CH₂CH₂O)_(g)(CH₂)_(n)(CH₂CH₂O)R¹⁷, wherein R¹⁷ is H or alkyl, each g is an integer from 0 to 5 (e.g., 2 to 5 or 1 to 3) and h is an integer from 0 to 5; X⁸ is O, CH₂ or NR¹⁴, it being understood that R¹⁴ is absent and X⁸ is CH when the group C(O)X⁷ or CH₂X⁷ is attached to X⁸ (e.g., X⁶ in Y is nitrogen; X⁸ in Y is CH₂; or X⁸ in Y is N or CH and the group C(O)X⁷ or CH₂X⁷ is attached to X⁸); m is an integer from 0 to 2;

(b) a group of the formula:

wherein X, R¹⁴, m, X⁷, and X⁸ are as defined herein; or

(c) a group of the formula:

or X is O or X, together with the carbon atom to which it is attached, is a CH₂ group; X¹ is alkylene; the dashed lines in the ring comprising X²-X⁴ each independently represents a single or a double bond; X², X³ and X⁴ are each independently O, NR¹² or C(R¹²)₂, wherein R¹² is H, alkyl, alkenyl, alkoxy, alkoxyalkyl or (CH₂)_(n)—N₃, wherein n is an integer from 1 to 6, or, in the case of C(R¹²)₂, two R¹² croups, together with the atom to which they are attached, form a cycloalkyl group; X⁵ is O, CH₂, NR¹⁴, wherein R¹⁴ is H, alkyl or a nitrogen protecting group; X⁶ is C or O, wherein R¹⁰ or R¹¹ is absent if X⁶ is O; R¹ is H or OR¹³, wherein R¹³ is H or alkyl; R³-R⁸ and R¹¹ are each independently H or alkyl or R² and R⁴, R⁴ and R⁶, R⁶ and R⁷ or R⁷ and R⁸, together with the atoms to which they are attached, form a cycloalkyl or a heterocyclyl group; and R⁹ and R¹⁰ are each independently H, alkyl, alkoxy, alkenyloxy, alkyloxyalkyloxy, alkylamino, alkenylamino, alkyloxyalkylamino or R⁸ and R¹⁰ or R⁹ and R¹¹, together with the atoms to which they are attached, form a cycloalkyl or a heterocyclyl group,

Various examples described herein are directed to a compound of the formula (II):

or a pharmaceutically acceptable salt, isomer, mixture of isomers, crystalline form, non crystalline form, hydrate, or solvate thereof wherein: Y is defined herein; X is O or X, together with the carbon atom to which it is attached, is a CH₂ group; X¹ is alkylene; X², X³ and X⁴ are each independently O, NR¹² or C(R¹²)₂, wherein R¹² is H, alkyl, alkenyl, alkoxy, alkoxyalkyl or (CH₂)_(n)—N₃, wherein n is an integer from 1 to 6, or, in the case of C(R¹²)₂, two R¹² groups, together with the atom to which they are attached, form a cycloalkyl group; X⁵ is O, CH₂, NR¹⁴, wherein R¹⁴ is H, alkyl or a nitrogen protecting group; X⁶ is C or O, wherein R¹⁰ or R¹¹ is absent if X⁶ is O; R¹ is H or OR¹³, wherein R¹³ is H or alkyl; R³-R⁸ and R¹¹ are each independently H or alkyl or R² and R⁴, R⁴ and R⁶, R⁶ and R⁷ or R⁷ and R⁸, together with the atoms to which they are attached, form a cycloalkyl or a heterocyclyl group; and R⁹ and R¹⁰ are each independently H, alkyl, alkoxy, alkenyloxy, alkyloxyalkyloxy, alkylamino, alkenylamino, alkyloxyalkylamino or R⁸ and R¹⁰ or R⁹ and R¹¹, together with the atoms to which they are attached, form a cycloalkyl or a heterocyclyl group. In some embodiments, X² is O. In other embodiments, X² is O; and X³ is C(R¹²)₂. In still other embodiments, X² is O; X³ is O or NR¹²; and X⁴ is C(R¹²)₂.

Various examples described herein are directed to a compound of the formula (ill):

or a pharmaceutically acceptable salt, isomer, mixture of isomers, crystalline form, non crystalline form, hydrate, or solvate thereof wherein: Y is defined herein; X is O or X, together with the carbon atom to which it is attached, is a CH₂ group; X¹ is alkylene; the dashed lines in the ring comprising X²-X⁴ each independently represents a single or a double bond; X² is N or CR¹², wherein R¹² is H, alkyl, alkoxy, alkoxyalkyl or (CH₂)_(n)—N₃, wherein n is an integer from 1 to 6; X is O, CH₂, NR¹⁴, wherein R¹⁴ is H, alkyl or a nitrogen protecting group; X⁶ is C or O, wherein R¹⁰ or R¹¹ is absent if X⁶ is O; R¹ is H or OR¹³, wherein R¹³ is H or alkyl; R³-R⁸ and R¹¹ are each independently H or alkyl or R² and R⁴, R⁴ and R⁶, R⁶ and R⁷ or R⁷ and R⁸, together with the atoms to which they are attached, form a cycloalkyl or a heterocyclyl group; and R⁹ and R¹⁰ are each independently H, alkyl, alkoxy, alkenyloxy, alkyloxyalkyloxy, alkylamino, alkenylamino, alkyloxyalkylamino or R⁸ and R¹⁰ or R⁹ and R¹¹, together with the atoms to which they are attached, form a cycloalkyl or a heterocyclyl group,

In some embodiments, in the compounds of the formula (I), (II) or (III), X is O; X¹ is CH₂; R¹, R³, R⁴, and R⁵ are each H; R², R⁶, R⁷, R⁸, and R¹¹ are each alkyl (e.g., methyl); R⁹ is alkoxy; R¹⁰ is hydroxy; X⁵ is O; and X⁶ is C. In addition, in some embodiments, the compounds of the formula (I), (II) or (III) have the following stereochemistry:

wherein A represents:

In some embodiments, the compounds of the formula (I), (Ia), (II) (IIa), (III) or (IIIa) are compounds of the following formulae:

wherein Y, X⁵, and R¹⁰-R¹² are as defined herein; R¹⁸ is alkyl, alkenyl or alkoxyalkyl; X⁹ is O, NR¹⁹, wherein R¹⁹ is alkyl or alkoxyalkyl; d is an integer from 0 to 1; and g is an integer from 1 to 2.

Specific compounds encompassed by the formula (I), (II) or (III) are compounds of the formula:

It should be readily apparent that, in some instances, the groups Y are designed to react with a group (e.g., a primary amine, —NH₂, or a sulfhydryl, —SH, group, which are “reactive groups”) on another molecule (e.g., a protein or antibody) to form, e.g., a covalent linkage between the compounds described herein and the other molecule. The reaction is illustrated herein in Scheme I for an antibody (not drawn to scale; see, e.g., Int. J. Mol. Sci. 17: 1-16 (2016), which is incorporated by reference as if fully set forth herein):

In addition, as shown in Scheme II, azide (—N₃) containing herboxidiene derivatives can be attached to an antibody or other molecules with a dibenzylcyclooctyne (DBCO)-containing antibody using copper-free (3+2) cycloaddition or click chemistry as described, e.g., in the literature (e.g., JACS 135: 12994 (2013); Chem. Commun. 46: 97-99 (2010); and Angew. Chem. INt. Ed. 47: 2253-2255 (2008), all of which are incorporated by reference as if fully set forth herein).

wherein G is N, CH₂, CHO, etc., and the linker can be any suitable Sinker.

Those of ordinary skill in the art will recognize that compounds described herein can contain chiral centers. All diastereomers of the compounds described herein are contemplated herein, as well as racemates, Prodrugs of the compounds described are also contemplated herein.

Various examples of the present invention also contemplate pharmaceutical compositions comprising one or more compounds of the various embodiments described herein (e.g., compounds of the formulae (I), (Ia), (II), (IIa), (III), and (IIIa)) and one or more pharmaceutically acceptable carriers, diluents, excipients or combinations thereof. A “pharmaceutical composition” refers to a chemical or biological composition suitable for administration to a subject (e.g., mammal). Such compositions may be specifically formulated for administration via one or more of a number of routes, including but not limited to buccal, cutaneous, epicutaneous, epidural, infusion, inhalation, intraarterial, intracardial, intracerebroventricular, intradermal, intramuscular, intranasal, intraocular, intraperitoneal, intraspinal, intrathecal, intravenous, oral, parenteral, pulmonary, rectally via an enema or suppository, subcutaneous, subdermal, sublingual, transdermal, and transmucosal. In addition, administration can by means of capsule, drops, foams, gel, gum, injection, liquid, patch, pill, porous pouch, powder, tablet, or other suitable means of administration.

A “pharmaceutical excipient” or a “pharmaceutically acceptable excipient” comprises a carrier, sometimes a liquid, in which an active therapeutic agent is formulated. The excipient generally does not provide any pharmacological activity to the formulation, though it may provide chemical and/or biological stability, and release characteristics. Examples of suitable formulations can be found, for example, in Remington, The Science And Practice of Pharmacy, 20th Edition, (Gennaro, A. R., Chief Editor), Philadelphia College of Pharmacy and Science, 2000, which is incorporated by reference in its entirety.

As used herein “pharmaceutically acceptable carrier” or “excipient” includes any and ail solvents, dispersion media, coatings, antibacterial and antifungal agents, isotonic and absorption delaying agents that are physiologically compatible. In one example, the carrier is suitable for parenteral administration. Alternatively, the carrier can be suitable for intravenous, intraperitoneal, intramuscular, sublingual, or oral administration. Pharmaceutically acceptable carriers include sterile aqueous solutions or dispersions and sterile powders for the extemporaneous preparation of sterile injectable solutions or dispersion. The use of such media and agents for pharmaceutically active substances is well known in the art. Except insofar as any conventional media or agent is incompatible with the active compound, use thereof in the pharmaceutical compositions of the invention is contemplated. Supplementary active compounds can also be incorporated into the compositions.

Pharmaceutical compositions may be sterile and stable under the conditions of manufacture and storage. The composition can be formulated as a solution, microemulsion, liposome, or other ordered structure suitable to high drug concentration. The carrier can be a solvent or dispersion medium containing, for example, water, ethanol, polyol (e.g., glycerol, propylene glycol, and liquid polyethylene glycol), and suitable mixtures thereof. The proper fluidity can be maintained, for example, by the use of a coating such as lecithin, by the maintenance of the required particle size in the case of dispersion and by the use of surfactants.

In many cases, it will be preferable to include isotonic agents, for example, sugars, polyalcohols such as mannitol, sorbitol, or sodium chloride in the composition. Prolonged absorption of the injectable compositions can be brought about by including in the composition an agent which delays absorption, for example, monostearate salts and gelatin. Moreover, the compounds described herein can be formulated in a time release formulation, for example in a composition that includes a slow release polymer. The active compounds can be prepared with carriers that will protect the compound against rapid release, such as a controlled release formulation, including implants and microencapsulated delivery systems. Biodegradable, biocompatible polymers may be used, such as ethylene vinyl acetate, polyanhydrides, polyglycolic acid, collagen, polyorthoesters, polylactic acid and polylactic, polyglycolic copolymers (PLG). Many methods for the preparation of such formulations are known to those skilled in the art.

Oral forms of administration are also contemplated herein. The pharmaceutical compositions of the present invention may be orally administered as a capsule (hard or soft), tablet (film coated, enteric coated or uncoated), powder or granules (coated or uncoated) or liquid (solution or suspension). The formulations may be conveniently prepared by any of the methods well-known in the art. The pharmaceutical compositions of the present invention may include one or more suitable production aids or excipients including fillers, binders, disintegrants, lubricants, diluents, flow agents, buffering agents, moistening agents, preservatives, colorants, sweeteners, flavors, and pharmaceutically compatible carriers.

For each of the recited examples, the compounds can be administered by a variety of dosage forms as known in the art. Any biologically-acceptable dosage form known to persons of ordinary skill in the art, and combinations thereof, are contemplated. Examples of such dosage forms include, without limitation, chewable tablets, quick dissolve tablets, effervescent tablets, reconstitutable powders, elixirs, liquids, solutions, suspensions, emulsions, tablets, multi-layer tablets, bi-layer tablets, capsules, soft gelatin capsules, hard gelatin capsules, caplets, lozenges, chewable lozenges, beads, powders, gum, granules, particles, microparticles, dispersible granules, cachets, douches, suppositories, creams, topicals, inhalants, aerosol inhalants, patches, particle inhalants, implants, depot implants, ingestibles, in (including subcutaneous, intramuscular, intravenous, and intradermal), infusions, and combinations thereof.

Other compounds which can be included by admixture are, for example, medically inert ingredients (e.g., solid and liquid diluent), such as lactose, dextrosesaccharose, cellulose, starch or calcium phosphate for tablets or capsules, olive oil or ethyl oleate for soft capsules and water or vegetable oil for suspensions or emulsions; lubricating agents such as silica, talc, stearic acid, magnesium or calcium stearate and/or polyethylene glycols; gelling agents such as colloidal clays; thickening agents such as gum tragacanth or sodium alginate, binding agents such as starches, arabic gums, gelatin, methylcellulose, carboxymethylcellulose or polyvinylpyrrolidone; disintegrating agents such as starch, alginic acid, alginates or sodium starch glycolate; effervescing mixtures; dyestuff; sweeteners; wetting agents such as lecithin, polysorbates or laurylsulphates; and other therapeutically acceptable accessory ingredients, such as humectants, preservatives, buffers and antioxidants, which are known additives for such formulations.

Liquid dispersions for oral administration can be syrups, emulsions, solutions, or suspensions. The syrups can contain as a carrier, for example, saccharose or saccharose with glycerol and/or mannitol and/or sorbitol. The suspensions and the emulsions can contain a carrier, for example a natural gum, agar, sodium alginate, pectin, methylcellulose, carboxymethylcellulose, or polyvinyl alcohol.

The amount of active compound in a therapeutic composition according to various examples of the present invention may vary according to factors such as the disease state, age, gender, weight, patient history, risk factors, predisposition to disease, administration route, pre-existing treatment regime (e.g., possible interactions with other medications), and weight of the individual. Dosage regimens may be adjusted to provide the optimum therapeutic response. For example, a single bolus may be administered, several divided doses may be administered over time, or the dose may be proportionally reduced or increased as indicated by the exigencies of therapeutic situation.

“Dosage unit form,” as used herein, refers to physically discrete units suited as unitary dosages for the mammalian subjects to be treated; each unit containing a predetermined quantity of active compound calculated to produce the desired therapeutic effect in association with the required pharmaceutical carrier. The specification for the dosage unit forms of the invention are dictated by and directly dependent on the unique characteristics of the active compound and the particular therapeutic effect to be achieved, and the limitations inherent in the art of compounding such an active compound for the treatment of sensitivity in individuals. In therapeutic use for treatment of conditions in mammals (e.g., humans) for which the compounds of the present invention or an appropriate pharmaceutical composition thereof are effective, the compounds of the present invention may be administered in an effective amount. The dosages as suitable for this invention may be a composition, a pharmaceutical composition or any other compositions described herein.

For each of the recited examples, the dosage is typically administered once, twice, or thrice a day, although more frequent dosing intervals are possible. The dosage may be administered every day, every 2 days, every 3 days, every 4 days, every 5 days, every 6 days, and/or every 7 days (once a week). In one example, the dosage may be administered daily for up to and including 30 days, preferably between 7-10 days. In another example, the dosage may be administered twice a day for 10 days. If the patient requires treatment for a chronic disease or condition, the dosage may be administered for as long as signs and/or symptoms persist. The patient may require “maintenance treatment” where the patient is receiving dosages every day for months, years, or the remainder of their lives. In addition, the composition of this invention may be to effect prophylaxis of recurring symptoms. For example, the dosage may be administered once or twice a day to prevent the onset of symptoms in patients at risk, especially for asymptomatic patients.

The compositions described herein may be administered in any of the following routes: buccal, epicutaneous, epidural, infusion, inhalation, intraarterial, intracardial, intracerebroventricular, intradermal, intramuscular, intranasal, intraocular, intraperitoneal, intraspinal, intrathecal, intravenous, oral, parenteral, pulmonary, rectally via an enema or suppository, subcutaneous, subdermal, sublingual, transdermal, and transmucosal. The preferred routes of administration are buccal and oral. The administration can be local, where the composition is administered directly, close to, in the locality, near, at, about, or in the vicinity of, the site(s) of disease, e.g., inflammation, or systemic, wherein the composition is given to the patient and passes through the body widely, thereby reaching the site(s) of disease. Local administration can be administration to the cell, tissue, organ, and/or organ system, which encompasses and/or is affected by the disease, and/or where the disease signs and/or symptoms are active or are likely to occur. Administration can be topical with a local effect, composition is applied directly where its action is desired. Administration can be enteral wherein the desired effect is systemic (non-local), composition is given via the digestive tract. Administration can be parenteral, where the desired effect is systemic, composition is given by other routes than the digestive tract.

In some examples, the various examples of the present invention contemplate pharmaceutical compositions comprising a therapeutically effective amount of one or more compounds of the various examples of the present invention. In some aspects, the various examples of the present invention contemplate compounds of the formulae (I)-(III) and (Ia)-(IIIa) for use as a medicament for treating a patient in need of relief from a disease or a condition, such as cancer. Other embodiments are directed to a method for treating a patient (e.g., a human patient) in need of relief from cancer, the method comprising the step of administering to the patient a therapeutically effective amount of a compound of the formula (I), (Ia), (II), (IIa), (III) or (IIIa) or a pharmaceutical composition comprising a therapeutically effective amount of a compound of the formula (I), (Ia), (II), (IIa), (III) or (IIIa).

The term “therapeutically effective amount” as used herein, refers to that amount of one or more compounds of the various examples of the present invention that elicits a biological or medicinal response in a tissue system, animal or human, that is being sought by a researcher, veterinarian, medical doctor or other clinician, which includes alleviation of the symptoms of the disease or disorder being treated. In some examples, the therapeutically effective amount is that which may treat or alleviate the disease or symptoms of the disease at a reasonable benefit/risk ratio applicable to any medical treatment. However, it is to be understood that the total daily usage of the compounds and compositions described herein may be decided by the attending physician within the scope of sound medical judgment. The specific therapeutically-effective dose level for any particular patient will depend upon a variety of factors, including the condition being treated and the severity of the condition; activity of the specific compound employed; the specific composition employed; the age, body weight, general health, gender and diet of the patient: the time of administration, route of administration, and rate of excretion of the specific compound employed; the duration of the treatment; drugs used in combination or coincidentally with the specific compound employed; and like factors well known to the researcher, veterinarian, medical doctor or other clinician. It is also appreciated that the therapeutically effective amount can be selected with reference to any toxicity, or other undesirable side effect, that might occur during administration of one or more of the compounds described herein.

Values expressed in a range format should be interpreted in a flexible manner to include not only the numerical values explicitly recited as the limits of the range, but also to include all the individual numerical values or sub-ranges encompassed within that range as it each numerical value and sub-range were explicitly recited. For example, a range of “about 0.1% to about 5%” or “about 0.1% to 5%” should be interpreted to include not just about 0.1% to about 5%, but also the individual values (ag, 1%, 2%, 3%, and 4%) and the sub-ranges (e.g., 0.1% to 0.5%, 1.1% to 2.2%, 3.3% to 4.4%) within the indicated range. The statement “about X to Y” has the same meaning as “about X to about Y,” unless indicated otherwise. Likewise, the statement “about X, Y, or about Z” has the same meaning as “about X, about Y, or about Z,” unless indicated otherwise.

In this document, the terms “a,” “an,” or “the” are used to include one or more than one unless the context clearly dictates otherwise. The term “or” is used to refer to a nonexclusive “or” unless otherwise indicated. In addition, it is to be understood that the phraseology or terminology employed herein, and not otherwise defined, is for the purpose of description only and not of limitation. Any use of section headings is intended to aid reading of the document and is not to be interpreted as limiting. Further, information that is relevant to a section heading may occur within or outside of that particular section. Furthermore, all publications, patents, and patent documents referred to in this document are incorporated by reference herein in their entirety, as though individually incorporated by reference.

In the methods described herein, the steps can be carried out in any order without departing from the principles of the invention, except when a temporal or operational sequence is explicitly recited. Furthermore, specified steps can be carried out concurrently unless explicit claim language recites that they be carried out separately. For example, a claimed step of doing X and a claimed step of doing Y can be conducted simultaneously within a single operation, and the resulting process will fall within the literal scope of the claimed process.

The term “about” as used herein can allow for a degree of variability in a value or range, for example, within 10%, within 5%, or within 1% of a stated value or of a stated limit of a range.

The term “substituted” as used herein refers to a group (e.g., alkyl, aryl, and heteroaryl) or molecule in which one or more hydrogen atoms contained thereon are replaced by one or more substituents. The term “substituent” as used herein refers to a group that can be or is substituted onto a molecule or onto a group. Examples of substituents include, but are not limited to, a halogen (e.g., F, Cl, Br, and I); an oxygen atom in groups such as hydroxyl groups, alkoxy groups, aryloxy groups, aralkyloxy groups, oxo(carbonyl) groups, carboxyl groups including carboxylic acids, carboxylates, and carboxylate esters; a sulfur atom in groups such as thiol groups, alkyl and aryl sulfide groups, sulfoxide groups, sulfone groups, sulfonyl groups, and sulfonamide groups; a nitrogen atom in groups such as amines, hydroxylamines, nitriles, nitro groups, N-oxides, hydrazides, azides, and enamines; and other heteroatoms in various other groups. Non-limiting examples of substituents that can be bonded to a substituted carbon (or other) atom include F, Cl, Br, I, OR, OC(O)N(R)₂, CN, NO, NO₂, ONO₂, azido, CF₃, OCF₃, R, O (oxo), S (thiono), C(O), S(O), methylenedioxy, ethylenedioxy, N(R)₂, SR, SOR, SO₂R, SO₂N(R)₂, SO₃R, C(O)R, C(O)C(O)R, C(O)CH₂C(O)R, C(S)R, C(O)OR, OC(O)R, C(O)N(R)₂, OC(O)N(R)₂, C(S)N(R)₂, (CH₂)₀₋₂N(R)C(O)R, (CH₂)₀₋₂N(R)N(R)₂, N(R)N(R)C(O)R, N(R)N(R)C(O)OR, N(R)N(R)CON(R)₂, N(R)SO₂R, N(R)SO₂N(R)₂, N(R)C(O)OR, N(R)C(O)R, N(R)C(S)R, N(R)C(O)N(R)₂, N(R)C(S)N(R)₂, N(COR)COR, N(OR)R, C(═NH)N(R)₂, C(O)N(OR)R, or C(═NOR)R, wherein R can be, for example, hydrogen, alkyl, acyl, cycloalkyl, aryl, aralkyl, heterocyclyl, heteroaryl, or heteroarylalkyl.

The term “alkyl” and “alkylene” as used herein refers to substituted or unsubstituted monovalent and divalent straight chain and branched alkyl and alkylene groups and cycloalkyl and cycloalkylene groups having from 1 to 40 carbon atoms (C₁-C₄₀), 1 to about 20 carbon atoms (C₁-C₂₀), 1 to 12 carbons (C₁-C₁₂), 1 to 8 carbon atoms (C₁-C₈), or, in some examples, from 1 to 6 carbon atoms (C₁-C₆). Examples of straight chain alkyl groups include those with from 1 to 8 carbon atoms such as methyl, ethyl, n-propyl, n-butyl, n-pentyl, n-hexyl, n-heptyl, and n-octyl groups. Examples of branched alkyl groups include, but are not limited to, isopropyl, iso-butyl, sec-butyl, t-butyl, neopentyl, isopentyl, and 2,2-dimethylpropyl groups. Examples of straight chain divalent alkylene groups include those with from 1 to 8 carbon atoms such as ethyl (—CH₂CH₂—), n-propyl (—CH₂CH₂CH₂—), n-butyl (—CH₂CH₂CH₂CH₂—), n-pentyl (—CH₂CH₂CH₂CH₂CH₂—), n-hexyl (—CH₂CH₂CH₂CH₂CH₂CH₂—), n-heptyl (—CH₂CH₂CH₂CH₂CH₂CH₂CH₂—), and n-octyl (—CH₂CH₂CH₂CH₂CH₂OH₂CH₂CH₂—) groups. Representative substituted alkyl groups can be substituted one or more times with any of the groups listed herein, for example, amino, hydroxy, cyano, carboxy, nitro, thio, alkoxy, and halogen groups.

The term “alkenyl” as used herein refers to straight and branched chain and cyclic alkyl groups as defined herein, except that at least one double bond exists between two carbon atoms. Thus, alkenyl groups have from 2 to 40 carbon atoms, or 2 to about 20 carbon atoms, or 2 to 12 carbons or, in some embodiments, from 2 to 8 carbon atoms. Examples include, but are not limited to vinyl, —CH═CH(CH₃), —CH═C(CH₃)₂, —C(CH₃)═CH₂, —C(CH₃)═CH(CH₃), —C(CH₂CH₃)═CH₂, cyclohexenyl, cyclopentenyl, cyclohexadienyl, butadienyl, pentadienyl, and hexadienyl among others.

As used herein, the term “hetero,” as used, e.g., in the term “heterocyclyl,” includes heteroatoms such as N, O, and S. In certain variations, illustrative heteroatoms also include phosphorus, and selenium.

The term “cycloalkyl” as used herein refers to substituted or unsubstituted cyclic alkyl groups such as, but not limited to, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, and cyclooctyl groups. In some examples, the cycloalkyl group can have 3 to about 8-12 ring members, whereas in other examples the number of ring carbon atoms range from 3 to 4, 5, 6, or 7. In some examples, cycloalkyl groups can have 3 to 6 carbon atoms (C₃-C₆). Cycloalkyl groups further include polycyclic cycloalkyl groups such as, but not limited to, norbornyl, adamantyl, bornyl, camphenyl, isocamphenyl, and carenyl groups, and fused rings such as, but not limited to, decalinyl, and the like.

The term “acyl” as used herein refers to a group containing a carbonyl moiety wherein the group is bonded via the carbonyl carbon atom. The carbonyl carbon atom is also bonded to another carbon atom, which can be part of a substituted or unsubstituted alkyl, aryl, aralkyl cycloalkyl, cycloalkylalkyl, heterocyclyl, heterocyclyl, heteroaryl, heteroarylalkyl group or the like. In the special case wherein the carbonyl carbon atom is bonded to a hydrogen, the group is a “formyl” group, an acyl group as the term is defined herein. An acyl group can include 0 to about 12-40; 6-10, 1-5 or 2-5 additional carbon atoms bonded to the carbonyl group. An acryloyl group is an example of an acyl group.

An acyl group can also include heteroatoms within the meaning here. A nicotinoyl group (pyridyl-3-carbonyl) is an example of an acyl group within the meaning herein. Other examples include acetyl, benzoyl, phenylacetyl, pyridylacetyl, cinnamoyl, and acryloyl groups and the like. When the group containing the carbon atom that is bonded to the carbonyl carbon atom contains a halogen, the group is termed a “haloacyl” group. An example is a trifluoroacetyl group.

The term “aryl” as used herein refers to substituted or unsubstituted cyclic aromatic hydrocarbons that do not contain heteroatoms in the ring. Thus aryl groups include, but are not limited to, phenyl, azulenyl, heptalenyl, biphenyl, indacenyl, fluorenyl, phenanthrenyl, triphenylenyl, pyrenyl, naphthacenyl, chrysenyl, biphenylenyl, anthracenyl, and naphthyl groups. In some examples, aryl groups contain about 6 to about 14 carbons (C₆-C₁₄) or from 6 to 10 carbon atoms (C₆-C₁₀) in the ring portions of the groups. Aryl groups can be unsubstituted or substituted, as defined herein. Representative substituted aryl groups can be mono-substituted or substituted more than once, such as, but not limited to, 2-, 3-, 4-, 5-, or 6-substituted phenyl or 2-8 substituted naphthyl groups, which can be substituted with carbon or non-carbon groups such as those listed herein.

The term “aralkyl” and “arylalkyl” as used herein refers to alkyl groups as defined herein in which a hydrogen or carbon bond of an alkyl group is replaced with a bond to an aryl group as defined herein. Representative aralkyl groups include benzyl and phenylethyl groups.

The term “heterocyclyl” as used herein refers to substituted or unsubstituted aromatic and non-aromatic ring compounds containing 3 or more ring members, of which, one or more is a heteroatom such as, but not limited to, N, O, and S. Thus, a heterocyclyl can be a cycloheteroalkyl, or a heteroaryl, or if polycyclic, any combination thereof. In some examples, heterocyclyl groups include 3 to about 20 ring members, whereas other such groups have 3 to about 15 ring members. In some examples, heterocyclyl groups include heterocyclyl groups that include 3 to 8 carbon atoms (C₃-C₆), 3 to 6 carbon atoms (C₃-C₆), 3 to 5 carbon atoms (C₃-C₅), 3 to 4 carbon atoms (C₃-C₄) or 6 to 8 carbon atoms (C₆-C₈). A heterocyclyl group designated as a C₂-heterocyclyl can be a 5-ring with two carbon atoms and three heteroatoms, a 6-ring with two carbon atoms and four heteroatoms and so forth. Likewise a C₂-heterocyclyl can be a 5-ring with one heteroatom, a 6-ring with two heteroatoms, and so forth. The number of carbon atoms plus the number of heteroatoms equals the total number of ring atoms. A heterocyclyl ring can also include one or more double bonds. A heteroaryl ring is an example of a heterocyclyl group. The phrase “heterocyclyl group” includes fused ring species including those that include fused aromatic and non-aromatic groups. Representative heterocyclyl groups include, but are not limited to piperidynyl, piperazinyl, morpholinyl, furanyl, pyrrolidinyl, pyridinyl, pyrazinyl, pyrimidinyl, triazinyl, thiophenyl, tetrahydrofuranyl, pyrrolyl, oxazolyl, imidazolyl, triazyolyl, tetrazolyl, benzoxazolinyl, and benzimidazolinyl groups.

The term “alkoxy” as used herein refers to an oxygen atom connected to an alkyl group, including a cycloalkyl group, as are defined herein, Examples of linear alkoxy groups include but are not limited to methoxy, ethoxy, propoxy, butoxy, pentyloxy, hexyloxy, and the like. Examples of branched alkoxy include but are not limited to isopropoxy, sec-butoxy, tert-butoxy, isopentyloxy, isohexyloxy, and the like. Examples of cyclic alkoxy include but are not limited to cyclopropyloxy, cyclobutyloxy, cyclopentyloxy, cyclohexyloxy, and the like. An alkoxy group can include one to about 12-20 or about 12-40 carbon atoms bonded to the oxygen atom, and can further include double or triple bonds, and can also include heteroatoms. For example, an allyloxy group is an alkoxy group within the meaning herein. A methoxyethoxy group is also an alkoxy group within the meaning herein, as is a methylenedioxy group in a context where two adjacent atoms of a structure are substituted therewith,

The term “alkenyloxy” as used herein refers to an oxygen atom connected to an alkenyl group.

The term “amine” as used herein refers to primary, secondary, and tertiary amines having, e.g., the formula N(group)₃ wherein each group can independently be H or non-H, such as alkyl, aryl, and the like. Amines include but are not limited to alkylamines, arylamines, arylalkylamines; dialkylamines, diarylamines, diaralkylamines, heterocyclylamines and the like; and ammonium ions.

The term “alkylamino” as used herein refers to —N(group)₂ group, wherein at least one of the groups is an alkyl group.

The term “alkenylamino” as used herein refers to N(group)₂ group, wherein at least one of the groups is an alkenyl group.

The terms “halo,” “halogen,” or “halide” group, as used herein, by themselves or as part of another substituent, mean, unless otherwise stated, a fluorine, chlorine, bromine, or iodine atom.

The term “amino acid side chain” refers to groups from amino acids, natural and unnatural, including the following groups, G: —CH₃, —CH(CH₃)₂, —CH₂CH(CH₃)₂, —CH(CH₃)CH₂CH₃, CH₂phenyl, —CH₂CH₂SCH₃, —CH₂C(O)NH₂, —CH₂OH, —(CH₂)₄NH₂, —CH₂CO₂H, that are commonly found in amino acids of the formula:

The term “nitrogen protecting group” refers to protecting groups for an amine or amide nitrogen. Suitable nitrogen protecting groups as well as suitable conditions for protecting and deprotecting particular functional groups are well known in the art. For example, numerous such protecting groups are described in T. W. Greene and P. G. M. Wuts, PROTECTING GROUPS IN ORGANIC SYNTHESIS, 3rd ed., Wiley, New York. Such nitrogen protecting groups include acetyl groups, an alkyloxycarbonyl group, including a t-butyl oxycarbonyl group, tosyl groups, mesyl groups, and the like.

As used herein, the term “salts” and “pharmaceutically acceptable salts” refer to derivatives of the disclosed compounds wherein the parent compound is modified by making add or base salts thereof. Examples of pharmaceutically acceptable salts include, but are not limited to, mineral or organic acid salts of basic groups such as amines; and alkali or organic salts of acidic groups such as carboxylic acids. Pharmaceutically acceptable salts include the conventional non-toxic salts or the quaternary ammonium salts of the parent compound formed, for example, from non-toxic inorganic or organic acids. For example, such conventional non-toxic salts include those derived from inorganic acids such as hydrochloric, hydrobromic, sulfuric, sulfamic, phosphoric, and nitric; and the salts prepared from organic acids such as acetic, propionic, succinic, glycolic, stearic, lactic, malic, tartaric, citric, ascorbic, pamoic, maleic, hydroxymaleic, phenylacetic, glutamic, benzoic, salicylic, sulfanilic, 2-acetoxybenzoic, fumaric, toluenesulfonic, methanesulfonic, ethane disulfonic, oxalic, and isethionic, and the like.

Pharmaceutically acceptable salts can be synthesized from the parent compound which contains a basic or acidic moiety by conventional chemical methods. In some instances, such salts can be prepared by reacting the free add or base forms of these compounds with a stoichiometric amount of the appropriate base or acid in water or in an organic solvent, or in a mixture of the two; generally, nonaqueous media like ether, ethyl acetate, ethanol, isopropanol, or acetonitrile are preferred. Lists of suitable salts are found in Remington's Pharmaceutical Sciences, 17th ed., Mack Publishing Company, Easton, Pa., 1985, the disclosure of which is hereby incorporated by reference.

The term “solvate” means a compound, or a salt thereof, that further includes a stoichiometric or non-stoichiometric amount of solvent bound by non-covalent intermolecular forces. Where the solvent is water, the solvate is a hydrate.

The term “prodrug” means a derivative of a compound that can hydrolyze, oxidize, or otherwise react under biological conditions (in vitro or in vivo) to provide an active compound, particularly a compound of the invention. Examples of prodrugs include, but are not limited to, derivatives and metabolites of a compound of the invention that include biohydrolyzable moieties such as biohydrolyzable amides, biohydrolyzable esters, biohydrolyzable carbamates, biohydrolyzable carbonates, biohydrolyzable ureides, and biohydrolyzable phosphate analogues. Specific prodrugs of compounds with carboxyl functional groups are the lower alkyl esters of the carboxylic acid. The carboxylate esters are conveniently formed by esterifying any of the carboxylic acid moieties present on the molecule. Prodrugs can typically be prepared using well-known methods, such as those described by Burger's Medicinal Chemistry and Drug Discovery 6th ed. (Donald J. Abraham ed., 2001, Wiley) and Design and Application of Prodrugs (H. Bundgaard ed., 1985, Harwood Academic Publishers GmbH).

The present invention provides for the following embodiments, the numbering of which is not to be construed as designating levels of importance:

Embodiment 1 relates to a compound of the formula (I):

-   -   or a pharmaceutically acceptable salt, isomer, mixture of         isomers, crystalline form, non crystalline form, hydrate, or         solvate thereof wherein:     -   Y is alkoxy or:     -   (a) a group of the formula:

-   -   wherein: X⁶ is O or N, it being understood that R¹⁴ is absent if         X⁶ is O; Y¹ is an amino acid side chain; L¹ is the group         CH(Y¹)NHC(O)CH(Y¹), wherein each Y¹ is, independently, an amino         acid side chain; R¹⁴ is H, alkyl or a nitrogen protecting group;         R¹⁵ is H or (CH₂)_(p)—R¹⁶, wherein R¹⁶ is N₃, —C≡C—CN, NHR¹⁴, or         a maleimide group and p is an integer from 0 to 6; X⁷ is NHR¹⁴,         OR¹⁷ or —O(CH₂CH₂O)_(g)(CH₂)_(h)(CH₂CH₂O)_(g)R¹⁷, wherein R¹⁷ is         H or alkyl, each g is an integer from 0 to 5 and h is an integer         from 0 to 5; X⁸ is O, CH₂ or NR¹⁴, it being understood that R¹⁴         is absent and X⁸ is CH when the group C(O)X⁷ or CH₂X⁷ is         attached to X⁸; m is an integer from 0 to 2;     -   (b) a group of the formula:

-   -   wherein X, R¹⁴, m, X⁷, and X⁸ are as defined herein; or     -   (c) a group of the formula:

-   -   X is O or X, together with the carbon atom to which it is         attached, is a CH₂ group;     -   X¹ is alkylene;     -   the dashed lines in the ring comprising X²-X⁴ each independently         represents a single or a double bond;     -   X², X³ and X⁴ are each independently O, NR¹² or C(R¹²)₂, wherein         R¹² is H, alkyl, alkenyl, alkoxy, alkoxyalkyl or (CH₂)_(n)—N₃,         wherein n is an integer from 1 to 6, or, in the case of C(R¹²)₂,         two R¹² groups, together with the atom to which they are         attached, form a cycloalkyl group;     -   X⁵ is O, CH₂, NR¹⁴, wherein R¹⁴ is H, alkyl or a nitrogen         protecting group;     -   X⁶ is C or O, wherein R¹⁰ or R¹¹ is absent if X⁶ is O;     -   R¹ is H or OR¹³, wherein R¹³ is H or alkyl;     -   R³-R⁸ and R¹¹ are each independently H or alkyl or R² and R⁴, R⁴         and R⁶, R⁶ and R⁷ or R⁷ and R⁸, together with the atoms to which         they are attached, form a cycloalkyl or a heterocyclyl group;         and     -   R⁹ and R¹⁰ are each independently H, alkyl, alkoxy, alkenyloxy,         alkyloxyalkyloxy, alkylamino, alkenylamino, alkyloxyalkylamino         or R⁸ and R¹⁰ or R⁹ and R¹¹, together with the atoms to which         they are attached, form a cycloalkyl or a heterocyclyl group.

Embodiment 2 relates to a compound of the formula (II):

-   -   or a pharmaceutically acceptable salt, isomer, mixture of         isomers, crystalline form, non crystalline form, hydrate, or         solvate thereof. wherein:     -   Y is alkoxy or:     -   (a) a group of the formula:

-   wherein: X⁶ is O or N, it being understood that R¹⁴ is absent if X⁶     is O; Y¹ is an amino acid side chain; L¹ is the group     CH(Y¹)NHC(O)CH(Y¹), wherein each Y¹ is, independently, an amino acid     side chain; R¹⁴ is H, alkyl or a nitrogen protecting group; R¹⁵ is H     or (CH₂)_(p)—R¹⁶, wherein R¹⁶ is N₃, —C≡C—CN, NHR¹⁴, or a maleimide     group and p is an integer from 0 to 6; X⁷ is NHR¹⁴, OR¹⁷ or     —O(CH₂CH₂O)_(g)(CH₂)_(h)(CH₂CH₂O)_(g)R¹⁷, wherein R¹⁷ is H or alkyl,     each g is an integer from 0 to 5 and h is an integer from 0 to 5; X⁸     is O, CH₂ or NR¹⁴, it being understood that R¹⁴ is absent and X⁸ is     CH when the group C(O)X⁷ or CH₂X⁷ is attached to X⁸; m is an integer     from 0 to 2; -   (b) a group of the formula:

-   wherein X, R¹⁴, m, X⁷, and X⁸ are as defined herein; or -   (c) a group of the formula:

-   X is O or X, together with the carbon atom to which it is attached,     is a CH₂ group; -   X¹ is alkylene; -   X², X³ and X⁴ are each independently O, NR¹² or C(R¹², wherein R¹²     is H, alkyl, alkenyl, alkoxy, alkoxyalkyl or (CH₂)_(n)—N₃, wherein n     is an integer from 1 to 6, or, in the case of C(R¹²)₂, two R¹²     groups, together with the atom to which they are attached, form a     cycloalkyl group; -   X⁵ is O, CH₂, NR¹⁴, wherein R¹⁴ is H, alkyl or a nitrogen protecting     group; -   X⁶ is C or O, wherein R¹⁰ or R¹¹ is absent if X⁶ is O; -   R¹ is H or OR¹³, wherein R¹³ is H or alkyl; -   R³-R⁸ and R¹¹ are each independently H or alkyl or R² and R⁴, R⁴ and     R⁶, R⁶ and R⁷ or R⁷ and R⁸, together with the atoms to which they     are attached, form a cycloalkyl or a heterocyclyl group; and -   R⁹ and R¹⁰ are each independently H, alkyl, alkoxy, alkenyloxy,     alkyloxyalkyloxy, alkylamino, alkenylamino, alkyloxyakyamino or R⁸     and R¹⁰ or R⁹ and R¹¹, together with the atoms to which they are     attached, form a cycloalkyl or a heterocyclyl group.

Embodiment 3 relates to the compound of Embodiments 1-2, wherein X² is O.

Embodiment 4 relates to the compound of Embodiments 1-3, wherein X² is O; and X³ is C(R¹²)₂.

Embodiment 5 relates to the compound of Embodiments 1-4, wherein X² is O; X³ is O or NR¹²; and X⁴ is C(R¹²)₂.

Embodiment 6 relates to a compound of the formula (Ill):

-   -   or a pharmaceutically acceptable salt, isomer, mixture of         isomers, crystalline form, non crystalline form, hydrate, or         solvate thereof wherein:     -   Y is alkoxy or:     -   (a) a group of the formula:

-   -   wherein: X⁶ is O or N, it being understood that R¹⁴ is absent if         X⁶ is O; Y¹ is an amino acid side chain; L¹ is the group         CH(Y¹)NHC(O)CH(Y¹), wherein each Y¹ is, independently, an amino         acid side chain; R¹⁴ is H, alkyl or a nitrogen protecting group;         R¹⁵ is H or (CH₂)_(p)—R¹⁶, wherein R¹⁶ is N₃, —C≡C—CN, NHR¹⁴, or         a maleimide group and p is an integer from 0 to 6; X⁷ is NHR¹⁴,         OR¹⁷ or —O(CH₂CH₂O)_(g)(CH₂)_(h)(CH₂CH₂O)_(g)R¹⁷, wherein R¹⁷ is         H or alkyl, each g is an integer from 0 to 5 and h is an integer         from 0 to 5; X⁸ is O, CH₂ or NR¹⁴, it being understood that R¹⁴         is absent and X⁸ is CH when the group C(O)X⁷ or CH₂X⁷ is         attached to X⁸; m is an integer from 0 to 2;     -   (b) a group of the formula:

-   -   wherein X, R¹⁴, m, X⁷, and X⁸ are as defined herein; or     -   (c) a group of the formula:

-   -   X is O or X, together with the carbon atom to which it is         attached, is a CH₂ group;     -   X¹ is alkylene;     -   the dashed lines in the ring comprising X²-X⁴ each independently         represents a single or a double bond;     -   X² is N or CR¹², wherein R¹² is H, alkyl, alkoxy, alkoxyalkyl or         (CH₂)_(n)—N₃, wherein n is an integer from 1 to 6;     -   X⁵ is O, CH₂, NR¹⁴, wherein R¹⁴ is H, alkyl or a nitrogen         protecting group;     -   X⁶ is C or O, wherein R¹⁰ or R¹¹ is absent if X⁶ is O;     -   R¹ is H or OR¹³, wherein R¹³ is H or alkyl;     -   R³-R⁸ and R¹¹ are each independently H or alkyl or R² and R⁴, R⁴         and R⁶, R⁶ and R⁷ or R⁷ and R⁸, together with the atoms to which         they are attached, form a cycloalkyl or a heterocyclyl group;         and     -   R⁹ and R¹⁰ are each independently H, alkyl, alkoxy, alkenyloxy,         alkyloxyalkyloxy, alkylamino, alkenylamino, alkyloxyalkylamino         or R⁸ and R¹⁰ or R⁹ and R¹¹, together with the atoms to which         they are attached, form a cycloalkyl or a heterocyclyl group.

Embodiment 7 relates to the compound of Embodiments 1-6, wherein X is O; X¹ is CH₂; R¹, R³, R⁴, and R⁵ are each H; R², R⁶, R⁷, R⁸, and R¹¹ are each alkyl; R⁹ is alkoxy; R¹⁰ is hydroxy; X⁵ is O; and X⁶ is C.

Embodiment 8 relates to the compound of Embodiments 1-7, wherein the compound has the formula:

-   -   wherein A represents:

Embodiment 9 relates to the compound of Embodiments 1-7, having the following formulae:

-   -   wherein Y, X⁵, and R¹⁰-R¹² are as defined herein; R¹⁸ is alkyl,         alkenyl or alkoxyalkyl; X⁹ is O, NR¹⁹, wherein R¹⁹ is alkyl or         alkoxyalkyl; d is an integer from 0 to 1; and q is an integer         from 1 to 2.

Embodiment 10 relates to the compound of Embodiments 1-9, wherein the compound is a compound of the formula:

Embodiment 11 relates to a pharmaceutical composition comprising one or more compounds of Embodiments 1-10 and one or more pharmaceutically acceptable carriers, diluents, excipients or combinations thereof.

Embodiment 12 relates to a method for treating a patient in need of relief from cancer, the method comprising the step of administering to the patient a therapeutically effective amount of a compound of any one of Embodiments 1-10.

Embodiment 13 relates to a compound of any one of Embodiments 1-10 for use as a medicament for treating a patient in need of relief from cancer. 

What is claimed is:
 1. A compound of the formula (I):

or a pharmaceutically acceptable salt, crystalline form, non crystalline form, hydrate, or solvate thereof wherein: Y is alkoxy or: (a) a group of the formula:

wherein: X⁶ is O or N, it being understood that R¹⁴ is absent if X⁵ is O; Y¹ is an amino acid side chain; L¹ is the group CH(Y¹)NHC(O)CH(Y¹), wherein each Y¹ is, independently, an amino acid side chain; R¹⁴ is H, alkyl or a nitrogen protecting group; R¹⁵ is or (CH₂)_(p)—R¹⁶, wherein R¹⁶ is N₃, —C≡C—CN, NHR¹⁴, or a maleimide group and p is an integer from 0 to 6; X⁷ is NHR¹⁴, OR¹⁷ or —O(CH₂CH₂O)_(g)(CH₂)_(h)(CH₂CH₂O)_(g)R¹⁷, wherein R¹⁷ is H or alkyl, each g is an integer from 0 to 5 and h is an integer from 0 to 5; X⁸ is O, CH₂ or NR¹⁴, it being understood that R¹⁴ is absent and X⁸ is CH when the group C(O)X⁷ or CH₂X⁷ is attached to X⁸; m is an integer from 0 to 2; (b) a group of the formula:

wherein X, R¹⁴, m, X⁷, and X⁸ are as defined herein; or (c) a group of the formula:

X is O; X¹ is CH₂; R¹, R³, R⁴, and R⁵ are each H; R², R⁶, R⁷, R⁸, and R¹¹ are each alkyl; R⁹ is alkoxy; R¹⁰ is hydroxy; X⁵ is O; and X⁶ is CH; the dashed lines in the ring comprising X²-X⁴ each independently a single or a double bond; X², X³ and X⁴ are each independently O, NR¹² or C(R¹²)₂, wherein R¹² is alkyl, alkenyl, alkoxy, alkoxyalkyl or (CH₂)_(n)—N₃, wherein n is an integer from 1 to 6, or, in the case of C(R¹²)₂, two R¹² groups, together with the atom to which they are attached, form a cycloalkyl group.
 2. The compound of claim 1, wherein the compound of the formula (I) is a compound of the formula (II) or formula (Iia):

or a pharmaceutically acceptable salt, crystalline form, non crystalline form, hydrate, or solvate thereof.
 3. The compound of claim 2, wherein X² is O.
 4. The compound of claim 2, wherein X² is O; and X³ is C(R¹²)₂.
 5. The compound of claim 2, wherein X² is O; X³ is O or NR¹²; and X⁴ is C(R¹²)₂.
 6. The compound of claim 1, wherein the compound of the formula (I) is a compound of the formula (III) or (IIIa):

or a pharmaceutically acceptable salt, crystalline form, non crystalline form, hydrate, or solvate.
 7. The compound of claim 1, wherein the compound has the formula:

wherein A represents:


8. The compound of claim 1, having the following formulae:

wherein Y, X⁵, and R¹⁰-R¹² are as defined herein; V is alkyl, alkenyl or alkoxyalkyl; X⁹ is O, NR¹⁹, wherein R¹⁹ is alkyl or alkoxyalkyl; d is an integer from 0 to 1; and q is an integer from 1 to
 2. 9. The compound of claim 1 wherein the compound is a compound of the formula:


10. A pharmaceutical composition comprising one or more compounds of claim 1 and one or more pharmaceutically acceptable carriers, diluents, excipients or combinations thereof.
 11. A method for treating a patient in need of relief from cancer, the method comprising the step of administering to the patient a therapeutically effective amount of one or more compounds of claim
 1. 